Lieut. Foster's abstract of the daily variation, &c. 119 
With a view to placing in evidence the proportional part 
of the annual variation due to each month, the mean of the 
maximum west and east expressions, has been assumed as the 
daily zero, or magnetic meridian ; but on reference to the 
column containing it, there appears such irregularities in its 
directions, as to render any conclusions drawn from it, very 
unsatisfactory. 
